Re: Question on Weighting

Posted by Barry on Sep 13, 2014; 4:37pm
URL: http://spssx-discussion.165.s1.nabble.com/Question-on-Weighting-tp5727231p5727246.html

Thanks, John! I think that one way to express it is that in general, I'd like to treat weights as proportionality coefficients, not as frequencies. I'll look up the documentation for complex samples. Barry

Jon K Peck wrote

Bear in mind that the proper weight treatment really depends on the nature of the weights and the procedure to be used. Standard SPSS weights are frequency weights and can expand the number of cases correspondingly. However, if you have survey weights from complex sampling designs, the procedures in the Complex Samples option are designed to take these fully into account. Jon Peck (no "h") aka Kim Senior Software Engineer, IBM [hidden email] phone: [phone] From: Barry DeCicco <[hidden email]> To: [hidden email] Date: 09/12/2014 07:31 AM Subject: [SPSSX-L] Question on Weighting Sent by: "SPSSX(r) Discussion" <[hidden email]> Hello, I think that I might be doing some analyses incorrectly; I've been using weights, which have averaged over 1 (they are based on volumes/response counts). In SPSS, are these interpreted as frequencies? If so, I believe that I've been falsely inflating the significances. Should I normalize the weights (divide by the mean, so that the new average is 1)? Thank you very much, Barry ===================== To manage your subscription to SPSSX-L, send a message to [hidden email] (not to SPSSX-L), with no body text except the command. To leave the list, send the command SIGNOFF SPSSX-L For a list of commands to manage subscriptions, send the command INFO REFCARD ===================== To manage your subscription to SPSSX-L, send a message to [hidden email] (not to SPSSX-L), with no body text except the command. To leave the list, send the command SIGNOFF SPSSX-L For a list of commands to manage subscriptions, send the command INFO REFCARD

Jon K Peck wrote

Bear in mind that the proper weight treatment really depends on the nature of the weights and the procedure to be used. Standard SPSS weights are frequency weights and can expand the number of cases correspondingly. However, if you have survey weights from complex sampling designs, the procedures in the Complex Samples option are designed to take these fully into account. Jon Peck (no "h") aka Kim Senior Software Engineer, IBM [hidden email] phone: [phone] From: Barry DeCicco <[hidden email]> To: [hidden email] Date: 09/12/2014 07:31 AM Subject: [SPSSX-L] Question on Weighting Sent by: "SPSSX(r) Discussion" <[hidden email]> Hello, I think that I might be doing some analyses incorrectly; I've been using weights, which have averaged over 1 (they are based on volumes/response counts). In SPSS, are these interpreted as frequencies? If so, I believe that I've been falsely inflating the significances. Should I normalize the weights (divide by the mean, so that the new average is 1)? Thank you very much, Barry ===================== To manage your subscription to SPSSX-L, send a message to [hidden email] (not to SPSSX-L), with no body text except the command. To leave the list, send the command SIGNOFF SPSSX-L For a list of commands to manage subscriptions, send the command INFO REFCARD ===================== To manage your subscription to SPSSX-L, send a message to [hidden email] (not to SPSSX-L), with no body text except the command. To leave the list, send the command SIGNOFF SPSSX-L For a list of commands to manage subscriptions, send the command INFO REFCARD